Which of the following is biggest factor that makes Computer Crimes possible? 以下哪一个因素最可能导致计算机犯罪？（）

A、Victim carelessness. 受害者的错心大意

B、Collusion with others in information processing. 与他人勾结处理信息

C、System design flaws. 系统设计的缺陷

D、The fraudster obtaining advanced training & special knowledge. 受过高级培训或掌握特殊技能的诈骗者